Imaging flow cytometer for imaging and analyzing particle components in a liquid sample

• US 5,444,527 A
• Filed: 06/02/1993
• Issued: 08/22/1995
• Est. Priority Date: 06/12/1992
• Status: Expired due to Fees

• Current Assignee: Toa Medical Electronics Co., Ltd.
• Original Assignee: Toa Medical Electronics Co., Ltd.
• Inventors: Kosaka, Tokihiro
• Primary Examiner(s): Mintel, William
• Assistant Examiner(s): TRAN, MINH LOAN
• Application Number:
  US08/070,201
• Time in Patent Office: 811 Days
• Field of Search: 356/72, 356/73, 356/317, 356/318, 356/39, 356/336, 250/574
• US Class Current: 356/73
• CPC Class Codes: G01N 15/1433 using image recognition
• CPC Class Codes: G01N 15/1459 the analysis being performed on a sample stream
• CPC Class Codes: G01N 2015/1447 Spatial selection

Abstract

An imaging flow cytometer for capturing images and, analyzing particle components in a liquid sample containing particle components such as blood and urine, or microparticles such as organic high molecules in a suspension. A video camera of a vertical split scanning type is used in the optical system of a conventional particle imaging type flow cytometer. Using the video camera which is capable of scanning a certain limited range in the vertical direction repeatedly in one field period, the number of particles that can be imaged in unit time may be notably increased as compared with the case of using a conventional video camera. By thus constructing, in a flow cytometer possessing a still picture imaging function, the number of captured particles can be increased.

Claims

1. An imaging flow cytometer for passing a sheath blow having a sheath liquid around a sample flow containing particles to be detected, irradiating a sample fine flow with light, and detecting light signals from the particles, comprising:

an irradiation light source for illuminating particles in the sample fine flow,

imaging means for imaging particles by receiving particle light images in a sample flow region of the sheath flow, and

an image processor for processing the images taken by said imaging means, wherein;

said imaging means is of the split scanning type capable of repetitively scanning a band-shaped scanning region of an imaging area limited to a certain range of the imaging area within one field period, and

said sample flow region is defined within the band-shaped scanning region of the imaging area.

2. An imaging flow cytometer of claim 1, further comprising:

means for detecting incoming of a particle, and wherein light for illuminating a particle is emitted according to particle detection by said means for detecting incoming of a particle.

3. An imaging flow cytometer of claim 2, further comprising:

an image intensifier for intensifying the particle light image being disposed before said imaging means, the image from said image intensifier being taken by said imaging means, wherein the light source for illuminating particles is a white light source.

4. An imaging flow cytometer of claim 2, further comprising:

means for lowering the coherency of the laser light, wherein the light source for illuminating particles is a pulse laser.

5. An imaging flow cytometer of claim 1, further comprising:

an image intensifier for intensifying the particle light image being disposed before said imaging means, the image from said image intensifier being taken by said imaging means, wherein the light source for illuminating particles is a white light source.

6. An imaging flow cytometer of claim 1 further comprising:

means for lowering the coherency of the laser light, wherein the light source for illuminating particles is a pulse laser.

7. An imaging flow cytometer of claim 1, wherein the flow direction of the sample flow and the longitudinal direction of the band-shaped scanning region are matched.